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Try to find a build-id through PT_NOTE program headers

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A=Mike Hommey <mh@glandium.org>
R=ted at https://breakpad.appspot.com/544003/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1143 4c0a9323-5329-0410-9bdc-e9ce6186880e
This commit is contained in:
ted.mielczarek@gmail.com 2013-04-04 16:24:52 +00:00
parent 6dc56cca44
commit b6e66b294f
4 changed files with 138 additions and 10 deletions
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65
src/common/linux/elfutils.cc
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@ -75,6 +75,35 @@ void FindElfClassSection(const char *elf_base,
}
}
template<typename ElfClass>
void FindElfClassSegment(const char *elf_base,
typename ElfClass::Word segment_type,
const void **segment_start,
int *segment_size) {
typedef typename ElfClass::Ehdr Ehdr;
typedef typename ElfClass::Phdr Phdr;
assert(elf_base);
assert(segment_start);
assert(segment_size);
assert(my_strncmp(elf_base, ELFMAG, SELFMAG) == 0);
const Ehdr* elf_header = reinterpret_cast<const Ehdr*>(elf_base);
assert(elf_header->e_ident[EI_CLASS] == ElfClass::kClass);
const Phdr* phdrs =
GetOffset<ElfClass,Phdr>(elf_header, elf_header->e_phoff);
for (int i = 0; i < elf_header->e_phnum; ++i) {
if (phdrs[i].p_type == segment_type) {
*segment_start = elf_base + phdrs[i].p_offset;
*segment_size = phdrs[i].p_filesz;
return;
}
}
}
} // namespace
bool IsValidElf(const void* elf_base) {
@ -126,4 +155,40 @@ bool FindElfSection(const void *elf_mapped_base,
return false;
}
bool FindElfSegment(const void *elf_mapped_base,
uint32_t segment_type,
const void **segment_start,
int *segment_size,
int *elfclass) {
assert(elf_mapped_base);
assert(segment_start);
assert(segment_size);
*segment_start = NULL;
*segment_size = 0;
if (!IsValidElf(elf_mapped_base))
return false;
int cls = ElfClass(elf_mapped_base);
if (elfclass) {
*elfclass = cls;
}
const char* elf_base =
static_cast<const char*>(elf_mapped_base);
if (cls == ELFCLASS32) {
FindElfClassSegment<ElfClass32>(elf_base, segment_type,
segment_start, segment_size);
return *segment_start != NULL;
} else if (cls == ELFCLASS64) {
FindElfClassSegment<ElfClass64>(elf_base, segment_type,
segment_start, segment_size);
return *segment_start != NULL;
}
return false;
}
} // namespace google_breakpad